GB1077232A - Improvements in conversion apparatus for use in telegraph systems - Google Patents

Improvements in conversion apparatus for use in telegraph systems

Info

Publication number
GB1077232A
GB1077232A GB1539764A GB1539764A GB1077232A GB 1077232 A GB1077232 A GB 1077232A GB 1539764 A GB1539764 A GB 1539764A GB 1539764 A GB1539764 A GB 1539764A GB 1077232 A GB1077232 A GB 1077232A
Authority
GB
United Kingdom
Prior art keywords
multivibrators
toggle
multivibrator
april
operative
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1539764A
Inventor
Norman George Green
Edward Hodgson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Telecommunications PLC
British Telecommunications Research Ltd
Original Assignee
British Telecommunications PLC
British Telecommunications Research Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by British Telecommunications PLC, British Telecommunications Research Ltd filed Critical British Telecommunications PLC
Priority to GB1539764A priority Critical patent/GB1077232A/en
Publication of GB1077232A publication Critical patent/GB1077232A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/20—Repeater circuits; Relay circuits
    • H04L25/22—Repeaters for converting two wires to four wires; Repeaters for converting single current to double current

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

1,077,232. Data transmission; transistor switching circuits. BRITISH TELECOMMUNICATIONS RESEARCH Ltd. April 8, 1965 [April 14, 1964], No. 15397/64. Headings H3T and H4P. To permit the use of a receiver with any one of various forms of line telegraph signals, a conversion circuit precedes the receiver and comprises two multivibrators connected across the line. The multivibrators are connected so that one operates in response to positive signals and the other to negative, and feed a toggle which is slow acting, whereby, when the toggle is switched from one state to the other, it remains in that state until the multivibrator which caused the switching ceases to operate. The circuitry preceding the multivibrators comprises resistor networks which are selected by switches so that the correct voltage is supplied to the multivibrators; the input may, for example, be single or double current and at 6v or 60v. In the case of single current, only one of the multivibrators is operative. The output toggle is fed via D.C. blocking capacitors and a switch which, for single current operation, selects the output of the operative multivibrator.
GB1539764A 1964-04-14 1964-04-14 Improvements in conversion apparatus for use in telegraph systems Expired GB1077232A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1539764A GB1077232A (en) 1964-04-14 1964-04-14 Improvements in conversion apparatus for use in telegraph systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1539764A GB1077232A (en) 1964-04-14 1964-04-14 Improvements in conversion apparatus for use in telegraph systems

Publications (1)

Publication Number Publication Date
GB1077232A true GB1077232A (en) 1967-07-26

Family

ID=10058434

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1539764A Expired GB1077232A (en) 1964-04-14 1964-04-14 Improvements in conversion apparatus for use in telegraph systems

Country Status (1)

Country Link
GB (1) GB1077232A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2188373A1 (en) * 1972-06-08 1974-01-18 Int Standard Electric Corp

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2188373A1 (en) * 1972-06-08 1974-01-18 Int Standard Electric Corp

Similar Documents

Publication Publication Date Title
US2629834A (en) Gate and trigger circuits employing transistors
US2864961A (en) Transistor electronic switch
GB1113111A (en) Digital storage devices
GB1501311A (en) Bistable circuit
US3183373A (en) High frequency high speed switching circuits
GB949531A (en) A bistable circuit
GB1060478A (en) Improvements in or relating to inverter circuits
US3066231A (en) Flip-flop circuit having pulse-forming networks in the cross-coupling paths
GB1077232A (en) Improvements in conversion apparatus for use in telegraph systems
US3008088A (en) Synchronized multivibrator with selectable clamping means for rendering it inoperative
US2954485A (en) Transistor binary counters with fast carry
US3315090A (en) Switching circuits utilizing opposite conductivity transistors
US2809304A (en) Transistor circuits
GB1023621A (en) Improvements in or relating to electrical signalling systems
GB1006262A (en) Digital pulse amplifier
GB1021915A (en) A frequency switching device
GB1405450A (en) Pulse generating circuit
GB1225464A (en)
GB1103797A (en) Improvements in switching circuits
GB1298835A (en) Electronic modulation retransmitter device
GB1279329A (en) A supervisory arrangement for a telegraph line
US2975305A (en) Transistor line switch
US3188497A (en) Single-transistor circuit producing pulse predetermined interval from trailing edge of final pulse in any pulse-train
GB1039771A (en) Improvements in transistor switching circuits
GB1101855A (en) Improvements relating to transistor circuits